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- Title
Compact and Wideband Parallel-Strip 180º Hybrid Coupler with Arbitrary Power Division Ratios.
- Authors
Leung Chiu; Quan Xue
- Abstract
This paper presents a class of wideband 180º hybrid (rat race) couplers implemented by parallel-strip line. By replacing the 270º arm of a conventional 180º hybrid coupler by a 90º arm with phase inverter, the bandwidth of the coupler is greatly enhanced and the total circuit size is reduced by almost half. Simple design formulas relating the characteristic impedance of the arms and power division ration are derived. To demonstrate the concept, four couplers with different power division ratios of 1, 2, 4, and 8 were designed, fabricated, and tested. S-parameters of the coupler are simulated and measured with good agreement. All working prototypes operate more than 112% impedance bandwidth with more than 25 dB port-to-port isolation and less than 5º absolute phase imbalance. The proposed 180º hybrid couplers can be employed as a wideband in-phase/differential power divider/combiner, which are essential for many RF and microwave subsystem designs.
- Subjects
ELECTRIC inverters; MICROWAVES; PROTOTYPES; STRIP line circuits; BANDWIDTHS; ELECTRIC impedance
- Publication
International Journal of Microwave Science & Technology, 2013, p1
- ISSN
1687-5826
- Publication type
Article
- DOI
10.1155/2013/567342